ATV rear shaft vibration/problems

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Jun 25, 2014
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1997 Suzuki LTF250 Quadrunner.

Problems:
- left side tire has uneven wear.
- inner u-joint protector is rubbing on engine case bolt
- Final drive output engine case seals leaking

U-joints seem tight, no play. The final drive shaft splines don't seem to be worn, neither is the inner u-joint splines, the Final drive bearings seem to be tight, so how is the u-joint protector rubbing on a engine bolt? the inner u-joint just slides on the final drive splines and a "C" spring holds it on.

I am thinking on removing the "C" spring, then slide on the inner u-joint, and try to wiggle, then use the U-joint on the other side and see if there is a difference in play?

Thoughts?

Video of a similar shaft below, Maybe my "u-joint timing" was off one spline tooth?




ATV diagram.jpg
 
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Does your quad see more air time than some airplanes? Air time plus lack of lube on the splines can bind the shaft and force it inward. Even lack of lube on the splines and no air time will do it, it will just take longer. Is the suspension smooth? Axles not bent?
 
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If the rubber boot has been torn, you may need a new u-joint. I rode my Suzuki 250 4x4 until a joint broke and the RF wheel left the machine.
 
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